Screen space is never at a premium for me on my regular desktop, but on my MacBook Air? Two side-by-side Sublime windows and it is over.
With a smaller physical size, I might worry about the ability to see with increased resolution. Another concern might be the ergonomics of the keyboard. I love my MacBook Air’s current keyboard; my hands shutter at the thought of scrunched key spacings.
But just one port? You get no mouse, you get no flash drive, you get nothing, except charging or just one more thing.